function landed(){
    if ($("#user_name").val() == ""||$('#user_password').val() == ""){
        alert("输入的帐号或密码不完整");
        return
    }
    var data = {reader:$("#user_name").val()};
    var url = "/landed/get_user_info";
    var success = function(data){
        if(data.password == $('#user_password').val()){
            location.href = '/data_manage/data_manage'
        }
    };
    var error = function(){
        alert('帐号或密码错误')
    };
    post_ajax(url,data,success,error)
}